EP 0652661 A3 19980617 - Cryptographic and scrambling system utilising a shared medium passive optical network.
Title (en)
Cryptographic and scrambling system utilising a shared medium passive optical network.
Title (de)
Verschlüsselungs- und Scramblereinrichtung unter Verwendung eines passiven optischen Netzwerks mit gemeinsamem Medium.
Title (fr)
Système de chiffrage et de brouillage utilisant un réseau optique passif à milieu partage.
Publication
Application
Priority
US 14875293 A 19931105
Abstract (en)
[origin: EP0652661A2] An improved method and apparatus encrypts and scrambles information cells transmitted on a telephone system local loop (11') from a central office to a plurality of user premises networks (14') via a shared medium passive optical network. Prior to transmission, the information cell is encrypted for security purposes and scrambled to improve its transmission properties by modulo 2 addition (218) of the information cell and a combined (214) encryption (211) and scrambling sum (212) pattern. At the other end of the passive optical network which is connected to user premises networks, the received encrypted and scrambled information cells are used to generate a processed cell by the modulo 2 addition of the received cell and a combined decryption and descramble sum pattern. <IMAGE>
IPC 1-7
IPC 8 full level
H04Q 3/00 (2006.01); H04L 9/18 (2006.01); H04L 9/24 (2006.01); H04L 25/03 (2006.01); H04Q 11/04 (2006.01); H04L 12/56 (2006.01)
CPC (source: EP US)
H04L 9/0662 (2013.01 - EP US); H04L 25/03866 (2013.01 - EP US); H04Q 11/0478 (2013.01 - EP US); H04L 2012/5673 (2013.01 - EP US); H04L 2012/5687 (2013.01 - EP US); H04L 2209/122 (2013.01 - EP US); H04L 2209/34 (2013.01 - EP US)
Citation (search report)
- [A] EP 0535982 A2 19930407 - FUJITSU LTD [JP]
- [A] "Secure communications System", COMPUTER DESIGN., vol. 18, no. 7, July 1979 (1979-07-01), LITTLETON, MASSACHUSETTS US, pages 145, XP002062268
- [DA] "B-ISDN user network interface-physical layer specification", CCITT RECOMMENDATION I.432, 1991, GENEVA, pages 1 - 15, XP002062500
- [A] MCCALMONT A M: "End-to-end data encryption in X.25 packet-switched networks", FIFTH ANNUAL INTERNATIONAL PHOENIX CONFERENCE ON COMPUTERS AND COMMUNICATIONS: PCCC'86. 1986 CONFERENCE PROCEEDINGS (CAT. NO.86CH2371-3), SCOTTSDALE, AZ, USA, 26-28 MARCH 1986, ISBN 0-8186-0691-6, 1986, WASHINGTON, DC, USA, IEEE COMPUT. SOC. PRESS, USA, pages 53 - 56, XP002062501
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0652661 A2 19950510; EP 0652661 A3 19980617; JP H07193566 A 19950728; US 5473696 A 19951205
DOCDB simple family (application)
EP 94307858 A 19941026; JP 29362394 A 19941104; US 14875293 A 19931105